Mechanism for operating winding-drum friction clutches



July10,1928.' v 1,676,765

R. H. BEAUMONT MECHANISM FOR OPERATING WINDING DRUM FRICTION JLUTCHES Filed Feb. 16, 192'? 2 Shets-Sheet 1 v m mwrm lWzwesa- F5567?! feaamon (LAW 7 July 10, 1928.

R. H. BEAUMONT MECHANISM FOR OPERATING WINDING DRUM FRICTION OLUTCHES' Filed Feb. 16, 1927 2 Sheets-Sheet 2 Patented July 16,1928

ROBERT H. BEAUMONT; OF RADNOR,PEI1NSYI$VANIA, AssIG'rvoR r R. H. Beam/a COMPANY, or PHILADELPHIA, PENNSYLVANIA, A conrona rroiv or PENNSY 'vANIn.

MEcHAuIsM Eon OPERATING WINDING-DRUM'FRIOTIOIT'GLUTCHES; 7

7 Application filed Februfry 1 Objects of the present invention are to vavoid jamming of-the friction clutch;'to permit of'the use o-f-an overpowered torque motor; to, if desired, avoid stalling the motor; to provide for relatively adjusting the time of engagement of the friction clutches and to compensatefor' their wear;

' to facilitate starting the motor; and to prevent the mechanism from hunting or over.- "running which 1s likely to produce 'ob]ectionable whipping of cables actuated by the.

drunn v v Other objects of the invention Wlll appear from the following description and the inr vention may be said to comprise mechanism foroperating. winding drum friction clutches including a motor, andpower transmission mechanism interposed between the friction clutches and the motor and including a friction-drive device arranged and. adapted to.

absorb motor torque.

The invention also comprises the improve ments to be presently described and finally claimed.- Y I forming part hereof'and: in which Figure 1 1s a topor plan View of one form of mechanism embodying features of the 1nvention for operatingwinding drum friction clutches, v

Fig. 2 is anelevational view of the same. Fig.3

of "scale; I v

Fig. {tie a horizontal central sectional view drawn to an enlarged scale of a part of the.

mechanism shownin' Fig. v1.

Fig. 5 is a viewsimilar to Fig. 3 but looking in the opposite direction and illustrating a modification, and 1 I Fig, 6 illustrates a detail of construct on.

Referring to the drawings there are winding drum friction clutches. With the exception that the screws 1 and 2 by which they a are actuated are on righthanded and the.

In the-following description reference will I be' made to the: accompanying 'drawlngs is a sectional view taken-on the line Fig.1 and drawn to an enlarged 1927.- SerialNo. 168,491:

clutches 1, both drums may disconnected from the gearwheels sothat both drums are at rest. Mechanism ofthe character deescribed is usually, though not, necessarily," employed for operat ng drag scrapers and 'inthat use it 1s eas ly associated withan electrical distant control constructed-and arranged to permit the operator to start, stop and reverse the mot-ionof thedragscraper;

There is nothing newabout the mech'ani'sm referredto'andexamples of it areto-be found in Letters Patent-No. 1,:")69,925"of,v

January {1-9, 1926, to W.- E. Hale,}and in Let ters Patent 'No. 1,577,161 of to R. H. Beaumont. g e 7 Referring to the drawingsthere is a motor 9 usually of the type called. torque motor and such a motor is a provision of the mechanisfmreferred to in the; above patents. -"-There March 16,- 1926,-- Y

is a power transmission mechanism inter-T posed between the friction clutches and the" motor, and in the patents above referred to are shown types of such transmission mecha- ,n1srn.- However, by. the present invention there is provided a-power transmissionmechanism, including novel features andadapted' tov correct faults heretofore existing and to the patents above referred to.

The: shaft 10 of the motor 9]is .connec ted the coupling 12 is of the lost motion variety accoinplishiresults not heretofore attained. It is. a fact that certain features of'the imr provements referred to are applicable as ad- V ditionsor substitutions'in the mechanisms of with the worm "drive shaft 11,-,as shownyby 1 means of a lost motion coupling 12. When '90 wit permits themotorshaft-10 to run ahead.

of-thefwvorm drive shaft 11 through a part of a revolution, and the advantage of this will be hereinafter set forth: The driven shaft 13, F1g. 4, operates through a friction clutches. As shown, Fig. lathe drum 14:.is

slip'drive device to position the friction I keyed or otherwise fast on the shaft 13, and

the cam 15 and sprocketchain wheels 16 and 17 are loosefor .rotation in respect to the shaft 18 but are connected together as by a key 1.8.

As shown the friction slip drive device comprises a split spring pressed band 19 lined with appropriate material and adapted to cooperate with the face of the drum 1 1. -The spring and bolt 20 afford means for increasing and diminishing the friction between the band 19 and the face v of the drum 14. The. friction slip drive de- K with the sprocket wheels 24 mounted on the vice also comprises a pin or post 21 rigid 'with the cam and engaging a staple on the band 19. 22 is a magnetic brake, Fig. 2, v shownas arranged to cooperate with the coupling '12; 23 are sprocket chain's cooper acting-through the described friction slip drive device, shifts one orthe other of the drums 5 and 6 to engage the corresponding frictionclutch 4, for example, the friction clutch appertainingto the drum 6. Rotation of the motor 9 inflthe' other-direction causes engagement of the clutch'4 of the drum 5, thus oneor the other of the cables 7 and 8 is wound on, whilst the other cable is free to play out. There is a" position in the movement of the motor 9 when both clutches 4 are disengaged. In application to a drag scraper, the operator by controlling the motor 9 may draw the scraper inor out or cause it to remain stationary.

I a part of usual electrical equipment by which It may be remarked that the cam 15' is the 'motor is caused to run to put bot clutches 4 out of engagement. As a part of this'electrical equipment the magnetic brake 22 maybe operated to'check the motor more particularly when it is intendedto stop it with-both friction clutches 4 out of engagement. The fact that the'coupling- 12'is of the lost motion variety enables the motor to start before it has to overcome the friction of rest of'the power transmission mechanism. The sprocket chain drives 23 have advantages among which may be mentioned the facility with which the drum clutch screws or levers may be angularly shiftedin respect 'to' each other in order to time the operation of'the clutches 4 and in order to compensate for wear of their friction surfaces. The friction slip drive device is adapted to 'absorbtorque of the motor 9, tl'ius by slippingpreventing the clutches 4 than is-necessary by reason of its standard design or the like in which case it can run without jamming the clutches 4, so that the specially designed motor need: not in all cases be stalled.

The construction and mode of operation of the modifications shown in Figs. 5 and 6 areas has been above described except that crank arms 25 and links 26. replace the sprocket gear above referred to, and in Fig. 6 the crank arm 25 is shown as Iangularly 1 adjustable through'the intervention of the set screw 27.

It will be obvious to those skilled in the art to which the invention relates that modi-.

fications' may be made in details of'construction and arrangement and in matters of mere form without departing from the spirit of the invention which is not limited to such matters or otherwise than the prior art andthe appended claim may require.

I claim: I Y

Mechanism for operating. twowinding drums comprising power mechanism, two"- driven element-s, power transmission mech'anism connected with the two movable e1ements and *movable in opposite directions to cause the engagement of one clutch and] the release of the other clutch, and a reversible motor having connection with said power transmission mechanism to move it in either direction, Sftld power transmission mechanism including a frictionslipfdrive device, and said motor being constructed and arranged to stall when said power transmission mechanism reaches its limitofmovement in either direction and the motor thereby serving to continue to apply force which, limited by the friction drive device, serves to hold the corresponding frictionclutch in engagement and to avoid jamming it.

ROBERT H, BEAUMONT. 

